How to turn on monochrome display mode?

[Android Central Question]

I've got HTC Desire with Android v.4.4.3.
Only advice I've found was to turn on it via "Simulate color space" but I'm missing that option in "Developer options" section.

 

[Tim1954]

Some devices have a super battery saver mode which puts the display into black and white...

 

[B. Diddy]

Welcome to Android Central! Which HTC Desire model? There are something like 4,253 out there. Ok, maybe not that many, but at least a dozen.

 

[p768583]

It's HTC Desire 510. Super battery save mode changes all interface to simplified version but, still not monochrome. What I want to achive is to keep everything same but colors.

 

[B. Diddy]

If there's no Greyscale option in Settings>Display or Settings>Accessibility, then you'd probably have to root the phone in order to go monochrome. You could try this app, which looks like it doesn't require root, but does require ADB: Greyscale

 

[p768583]

Unfortunately there is no such optron in either Accessibility nor Display submenu. I'll try the app you recommended. Thanks for the help.